2178439 has 2 divisors, whose sum is σ = 2178440. Its totient is φ = 2178438.

The previous prime is 2178433. The next prime is 2178443. The reversal of 2178439 is 9348712.

2178439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2178439 - 2¹³ = 2170247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2178433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089219 + 1089220.

It is an arithmetic number, because the mean of its divisors is an integer number (1089220).

2^2178439 is an apocalyptic number.

2178439 is a deficient number, since it is larger than the sum of its proper divisors (1).

2178439 is an equidigital number, since it uses as much as digits as its factorization.

2178439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 34.

The square root of 2178439 is about 1475.9535900563. The cubic root of 2178439 is about 129.6328694952.

The spelling of 2178439 in words is "two million, one hundred seventy-eight thousand, four hundred thirty-nine".